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memory: give phys_page_find() its own tree search loop

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We'll change phys_page_find_alloc() soon, but phys_page_find()
doesn't need to bear the consequences.

Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Avi Kivity 2012-02-13 16:44:19 +02:00
parent 06ef3525e1
commit 31ab2b4a46
1 changed files with 13 additions and 4 deletions
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17
exec.c
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@ -459,14 +459,23 @@ static uint16_t *phys_page_find_alloc(target_phys_addr_t index, int alloc)
static MemoryRegionSection phys_page_find(target_phys_addr_t index)
{
uint16_t *p = phys_page_find_alloc(index, 0);
uint16_t s_index = phys_section_unassigned;
PhysPageEntry lp = phys_map;
PhysPageEntry *p;
int i;
MemoryRegionSection section;
target_phys_addr_t delta;
uint16_t s_index = phys_section_unassigned;
if (p) {
s_index = *p;
for (i = P_L2_LEVELS - 1; i >= 0; i--) {
if (lp.u.node == PHYS_MAP_NODE_NIL) {
goto not_found;
}
p = phys_map_nodes[lp.u.node];
lp = p[(index >> (i * L2_BITS)) & (L2_SIZE - 1)];
}
s_index = lp.u.leaf;
not_found:
section = phys_sections[s_index];
index <<= TARGET_PAGE_BITS;
assert(section.offset_within_address_space <= index